Hey guys... I saw this thing on the side of the road the other day, and went and found it on Google Images. My first thought was that it was a Hako or Kenmeri. It is undoubtly Datsun, and early seventies. I thought I knew classic JDM, but had to have one of my buddies on Facebook ID it... I'll try to get actual pictures of it tomorrow.
Yes, you did read Okinawa prefecture. I'm stationed here right now. There isn't too many old school JDM rides here, I am having a heck of a time trying to find stuff for my RA40 Celica!